JPS5826811Y2 - Leveling valve for air suspension - Google Patents

Description

[Detailed description of the invention] This invention relates to leveling pulp for air suspensions installed in buses and the like.

As is well known, air suspension always maintains a constant vehicle height regardless of the weight of the load.

Therefore, when boarding or disembarking a bus equipped with air suspension from a car ferry, etc., the vehicle may be forced to climb a steep slope that is shorter than the wheel base, which may cause the rear overhang to touch the ground. If the vehicle height is set high for this reason, there is a drawback that it deteriorates the ease of getting on and off the vehicle, maneuverability, and running stability for passengers.

This idea was made to eliminate the above-mentioned drawbacks of the conventional system, and by slightly improving the conventional leveling pulp, the air suspension system allows the driver to adjust the vehicle height at will. The purpose of this project is to provide leveling pulp for industrial use.

Hereinafter, this invention will be described in detail with reference to embodiments shown in the accompanying drawings.

First, in FIGS. 1, 2 and 3 showing one embodiment, 1 is a wheel, 2 is an axle, 3 is a frame, and a bellows is provided between the frame 3 and a surge tank 4 fixed to the axle 2. 5 is interposed.

6 is a near compressor that is rotationally driven by the engine.

1 is a check valve, 8 is a main tank, and 9 is a pressure regulator pulp, which sends the compressed air sent out from the main tank 8 to the surge tank 4 through the leveling pulp 10 fixed to the frame 3, or through the leveling pulp 10. The compressed air in the surge tank 4 is discharged to expand and contract the bellows 5 so that the vehicle height can be maintained constant.

11 is a lever that switches and operates the leveling pulp 10
12 is a link rod that connects the tip of the lever 11 and the surge tank 4 fixed to the axle 2Vc.

A rocker 14 is fixed to the support shaft 13 of the link rod 11 of the leveling pulp 10, and an arm 15 is pivotally supported so as to be swingable left and right.

Reference numeral 16 denotes a leveling shaft that is supported so as to be slidable left and right, and a pair of left and right spring seats 17, 17 that come into contact with both left and right side surfaces of the rocker 14 and arm 15 are slidably inserted therein, and a leveling shaft 16 is slidably supported at both ends thereof. Spring catch is, i
s is fixed, and springs 19, 19 are installed between the spring seats 17, 1γ and the spring receivers 18, 18, respectively.
19 is kept stretched.

20 is a piston into which the tip of the arm 15 is thrust and engaged, and damper chambers 21.2 are provided on both left and right sides of the piston.
1, and these damper rooms 21, 21 are communicated with each other by a communication passage 23 provided with a variable throttle valve 22.

24 is a feed port 25 connected to the main tank 8
21 is a normally closed feed valve that opens and closes between the connection port 26 and the surge tank 4, and 21 is a normally closed feed valve that opens and closes the connection port 26 and the efjest port 28 that is open to the atmosphere. , the rod portions of both pulps 24 and 27 are connected to the damper room 21, respectively.
．． The piston 21 is made to protrude into the piston 21 and face the end surface of the piston 20.

Further, a lever rod 29 connected to one end of the leveling shaft 16 and a control lever 30 provided in the driver's cab are connected by a link rod 31, and the lever 30 is connected to the engagement grooves 33, 33 of the lever guide 32. By selectively engaging . . . , the leveling shaft 16 can be controlled to slide left and right.

In the Hering valve for air suspension configured as described above, if the control lever 30 is locked in the neutral position as shown in FIG. 1, the rocker 14 and arm 15 are tensioned equally from the left and right Retained.

Therefore, when the load is in a balanced state, the lever 11
is held in a horizontal state, and both the feed valve 24 and the nitrogen thrust valve 2γ are held in a closed state, so that compressed air is not supplied to or discharged from the bellows 5.

When the load increases and the bellows 5 bends, the lever 11 is pushed upward by the link rod 12, swinging the rocker 14 fixed to the support shaft 13 of the lever 11 to the right, and pressing the spring 19 on the right side.

Then, the pressing force on the arm 15 from the right side is released, so the arm 15 is pushed by the left spring 19 and swings to the right around the support shaft 13, causing the piston 20 engaged with the tip thereof to move to the right. move it.

Note that, at this time, the damper rooms 21.21 formed on both the left and right sides of the piston 20 are communicated with each other through the communication passage 23 provided with the variable throttle valve 22, so the piston 20 moves slowly.

When the piston 20 moves to the right in this way, the feed valve 2 protruding into the damper room 21 on the right side
4 is pushed to open the feed valve 24.

Therefore, the compressed air stored in the main tank 8 flows from the feed port 25 to the connection port 26, flows into the surge tank 4, and causes the bellows 5 to expand.

When the bellows 5 extends to a predetermined length, the lever 11 returns to the horizontal state, returns the piston 20 to the neutral position, and stops the supply of compressed air.

On the other hand, when the load decreases, the bellows 5 extends and the vehicle height increases, so the lever 11 swings downward, swings the arm 15 to the left, moves the piston 20 to the left, and closes the nitrogen thrust valve 2T. open.

Therefore, the surge tank 4 is discharged, and the bellows 5
When becomes short to a predetermined length, the lever 11 becomes horizontal in the same way as described above, returns the piston 20 to neutral, closes the nitrogen seast valve 21, and stops exhaust gas.

In this way, the vehicle height can be maintained constant, but when the load is in a balanced state as shown in FIGS. 1 and 2, the engagement and fixed position of the control lever 30 is When the leveling shaft 16 is changed to the right side as shown in FIG. 3, the pressing force applied to the arm 15 from the left side becomes stronger, and the arm 15 moves to the right side.

As a result, the piston 20 moves to the right, opens the feed valve 24, extends the bellows 5, and raises the vehicle height.

Furthermore, when the control lever 30 is moved in the opposite direction to move the leveling shaft 16 to the left, the lower seat valve 27 opens, shortening the bellows 5 and lowering the vehicle height.

In this way, the vehicle height can be adjusted higher or lower than the standard setting amount, but when the control lever 30 is returned to the neutral position, the lever 11 performs the automatic adjustment action as described above, and the vehicle height returns to the standard position. It can be returned.

Note that when changing the vehicle height, it is necessary to substantially release the lever 110 function, so either a release mechanism is provided at the connecting part such as the link rod 12, the lever 11, or the rocker 13, or the above-mentioned connection It is necessary to allow sufficient play in the parts.

In the above embodiment, the control lever 30 and the link rod 31 are used as sliding control means for the leveling shaft 16, but the embodiment shown in FIG. 4 may be used.

In the embodiment shown in FIG. 4, one end of the leveling shaft 16 and the moving end of the control cylinder 34 are connected by a lever 29.
This embodiment differs from the embodiment described above in that a magnetic valve 35 interposed between the cylinder 34 and the main tank 8 is connected to a control switch 36 provided in the driver's cab, but otherwise has the same configuration.

31 is a battery. Therefore, in the leveling valve shown in FIG. 4, when the control switch 36 is opened, the leveling shaft 16 is held in the neutral position, and when the control switch 36 is closed, the magnetic valve 35 is opened and the control cylinder 34 is When activated, the lever lever 29 swings to move the leveling shaft 16 to the left, thereby lowering the vehicle height.

As is clear from the above description, the leveling valve for air suspension according to this invention has an extremely simple configuration in which the leveling shaft is simply slidable and the shaft control device is provided in the driver's cab. The driver can adjust the vehicle height by controlling the opening and closing of the feed valve and efjest valve at will, so the standard vehicle height can be kept relatively low to maintain high ease of entry and exit, maneuverability, and driving stability, while maintaining high ease of entry and exit, maneuverability, and driving stability. Accordingly, the vehicle height can be increased to prevent the rear overhang from touching the ground.

[Brief explanation of the drawing]

The drawings show a leveling valve for air suspension according to this invention, and FIG. 1 is an overall configuration diagram of one embodiment, FIG. 2 is a longitudinal sectional view of the main parts of the same, and FIG. 3 is a longitudinal sectional view of the main parts of the same. FIG. 4 is a vertical cross-sectional view of main parts showing another embodiment. 10... Leveling valve, 14...
Rocker, 15... Arm, 16... Leveling shaft, 19... Spring, 24
・・・・・・Feed valve, 27・・・Exhaust valve 7”, 30・・・Control lever 36・
...Control switch.

Claims (1)

[Scope of utility model registration request] An arm that moves left and right between the feed valve and the F-jest valve to control the opening and closing of the valve, and a rocker that moves left and right as the vehicle height changes are slidable on a leveling shaft that supports the arm that can move left and right. The arm and rocker are interlocked and interlocked between a pair of left and right spring seats inserted into the leveling shaft, and springs are stretched between the spring seats and the spring receivers fixed to both ends of the leveling shaft to set the arm and rocker at the neutral position. A leveling pulp for an air suspension, characterized in that a control device for maintaining elastic pressure and changing and controlling the left and right positions of the leveling shaft is provided in the driver's cab.